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By Mere Observation II

Our previous Math Tip deals with recognizing numbers divisible by 11. The next logical lesson should be how to determine the remainder when a number is divided by 11. This is the subject of this question, which was given the…

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By Mere Observation

A number is divisible by 11 if the alternating sum of the digits is 0 or a multiple of 11. This also means that the difference between the sum of the odd-placed digits and the sum of the even-placed digits…

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